Find the midpoints.
25.5, 35.5, 45.5, 55.5, 65.5, 75.5
20.5, 30.5, 40.5, 50.5, 60.5, 70.5, 80.5
21, 31, 41, 51, 61, 71
30, 40, 50, 60, 70, 80
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